Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative assets	$ 617.0	$ 473.7
Derivatives liabilities	526.1	227.9
Fixed maturities
Derivatives, Fair Value [Line Items]
Derivative assets	22.1	23.4
Derivatives liabilities	0.0	0.0
Within annuity products
Derivatives, Fair Value [Line Items]
Derivative assets	0.0	0.0
Derivatives liabilities	284.5	184.1
Reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivative assets	0.0	0.0
Derivatives liabilities	1.5	(71.6)
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	23,897.6	22,965.5
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	264.6	195.8
Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	91.6	0.0
Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	557.5	407.5
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	97.8	285.3
Designated as Hedging Instrument \| Interest rate contracts \| Derivatives \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative assets	22.4	60.1
Derivatives liabilities	0.0	0.0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	70.3	51.2
Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative assets	6.2	10.7
Derivatives liabilities	0.1	0.0
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	27,504.7	25,309.1
Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	552.2	362.3
Derivatives liabilities	226.1	104.0
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	194.3	144.6
Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	7.8	13.9
Derivatives liabilities	9.2	10.7
Not Designated as Hedging Instrument \| Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	91.6	15.9
Not Designated as Hedging Instrument \| Equity contract \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	2.3	0.0
Derivatives liabilities	0.0	0.1
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	557.5	407.5
Not Designated as Hedging Instrument \| Credit contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	4.0	3.3
Derivatives liabilities	0.3	0.3
Not Designated as Hedging Instrument \| Managed custody guarantees \| Derivatives
Derivatives, Fair Value [Line Items]
Derivative assets	0.0	0.0
Derivatives liabilities	$ 4.4	$ 0.3

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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